Reading contents of PALS like the 16L8 or 16R8

Wouter de Waal wrote: The "Turbo Mac" work I did for brazillian cloner Unitron back in 1987 was a clean room design based on public sources (essentially the January 1984 issue of Byte Magazine and volume III of Inside Macintosh), as described in: http://merlintec.com/lsi/mac512.html For those who just prefer the overview: the 512K Mac ("Fat Mac") used faster memory chips than the original 128K Macs, but Apple didn't take advantage of that. Doing so only required changing the PAL configuration while keeping the board exactly the same, so there was no extra cost for this small increase in performance. After I did the job, I turned all material I had over to Unitron. Slightly more than a decade later, I found out I had some scratch documents from the project that had been forgotten in a briefcase. Though my contractual obligation was to either destroy this material or also turn it over to Unitron, I figured that they no longer cared as they had exited the computer business in 1988 or 1989. So I kept it around in the interest of preserving history. Around 2006 someone was trying to reverse engineer the Mac PALs. I made what material I had available at: http://merlintec.com/download/ (files with "unitron" in their names) and someone else mentioned that they had the original equations from being an Apple service representative at the time. He posted the original sources online and I skimmed over them but did not save a copy. It was the first time I had seen the Apple design and found it a bit messier than I expected. Some important points about the material I published: these are very early sketches and when these equations were configured into a prototype's GALs by accident the machine did not turn on at all (the analog board didn't generate the needed supply voltages). This was fixed by reconfiguring them with the latest equations. I do not remember what changed between the non working and working versions, but it was something obvious because I was able to tell which were which with just a quick glance. Of course, since I did the work then I could do it again but I don't see the point. The key idea is the change in the memory cycle and this material shows this clearly enough. The second point is that since my work was not based on Burrell Smith's you will miss lots of interesting details about the original Mac if you just look at my project. -- Jecel